Ok, i seen the movie now for the 4th time. I paid EXTRA close attention this time. I seen that when they come in there is 8 planes. Starscream "disables"/shoots down 3 of them, leaving 5..... he jumps into there formation..... TWO...YES 2 planes of the remaining 5/6 including starscream, shoot/strife at Megatron, then TWO....yes 2 planes come down and shoot/strife megatron. THEN you if you look behind megatron, you will see one fighter and a fighter a bit behind that, NEITHER of them shoot at megatron..... SO, MY thoughts after seeing it for the 4th time is that Starscream DOES NOT help shoot down mega, but if later someone comes out and says that he does help I will say that I was wrong.